Spectrometer arrangement

Abstract

The present disclosure resides in a spectrometer arrangement including a first dispersing element for spectral separation of radiation in a main dispersion direction, and a second dispersing element for spectral separation of radiation in a cross-dispersion direction, which is at an angle to the main dispersion direction, so that a two-dimensional spectrum is producible. The spectrometer arrangement also includes a collimating optics, which directs collimated radiation to the first and/or second dispersing element, a camera optics, which images a two-dimensional spectrum in an image plane, a two-dimensional detector for detecting the two-dimensional spectrum in the image plane, and an off-axis section of a rotationally symmetric, refractive element, which is arranged between the camera optics and the detector. The present disclosure resides likewise in an optical module comprising such a spectrometer arrangement.

The invention claimed is: 
     
       1. A spectrometer arrangement, including:
 a first dispersing element for spectral separation of radiation in a main dispersion direction; 
 a second dispersing element for spectral separation of radiation in a cross-dispersion direction, which is at an angle to the main dispersion direction, so that a two-dimensional spectrum is producible; 
 a collimating optics, which directs collimated radiation to the first and/or second dispersing element; 
 a camera optics, which images a two-dimensional spectrum in an image plane; 
 a two-dimensional detector for detecting the two-dimensional spectrum in the image plane; and 
 an off-axis section of a rotationally symmetric, refractive element, which is arranged between the camera optics and the two-dimensional detector. 
 
     
     
       2. The spectrometer arrangement of  claim 1 , wherein the refractive element is embodied as a biconvex lens. 
     
     
       3. The spectrometer arrangement of  claim 1 , wherein the refractive element is embodied as a spherical lens. 
     
     
       4. The spectrometer arrangement of  claim 1 , wherein at least one lens area is embodied aspherically. 
     
     
       5. The spectrometer arrangement of  claim 1 , wherein the refractive element includes an anti-reflective coating. 
     
     
       6. The spectrometer arrangement of  claim 1 , wherein the refractive element is manufactured from a low dispersing material. 
     
     
       7. The spectrometer arrangement of  claim 1 , wherein the collimating optics and/or the camera optics includes a concave mirror. 
     
     
       8. The spectrometer arrangement of  claim 1 , wherein the first dispersing element is embodied as an echelle grating. 
     
     
       9. The spectrometer arrangement of  claim 1 , wherein the first dispersing element is replaced with a mirror arranged perpendicularly to the image plane of the two-dimensional detector, and wherein the two-dimensional detector is replaced by a one-dimensional detector. 
     
     
       10. The spectrometer arrangement of  claim 1 , wherein the second dispersing element is embodied as a prism. 
     
     
       11. The spectrometer arrangement of  claim 10 , wherein the prism is reflectively coated on a rear side. 
     
     
       12. The spectrometer arrangement of  claim 10 , wherein the prism is rotatably seated. 
     
     
       13. The spectrometer arrangement of  claim 1 , wherein the spectrometer arrangement forms a Littrow spectrometer. 
     
     
       14. An optical module for retrofitting a spectrometer arrangement, including:
 wherein the spectrometer arrangement includes a first dispersing element for spectral separation of radiation in a main dispersion direction, a second dispersing element for spectral separation of radiation in a cross-dispersion direction, which is at an angle to the main dispersion direction, so that a two-dimensional spectrum is producible, a collimating optics, which directs collimated radiation to the first and/or second dispersing element, a camera optics, which images a two-dimensional spectrum in an image plane, and a two-dimensional detector for detecting the two-dimensional spectrum in the image plane; 
 at least a rotationally symmetric, refractive element, an off-axis section of which is configured for positioning between the camera optics and the two-dimensional detector.